QUESTION 43 Some plants, such as cactus, has a carbon-fixing adaptation to deser

Question

QUESTION 43 Some plants, such as cactus, has a carbon-fixing adaptation to desert conditions. Their stomata close during the day and open at night to fixe CO 2. They are O a. C3 plants O b. C4 plants Oc. CAM plants QUESTION 44 Which is the smallest portion of a substance that retains the properties of an element? a. atom b compound c. ion O d. molecule e. mixture QUESTION 45 Radioactive isotopes O a. are electrically unbalanced b. behave the same chemically and physically but differ biologically from other isotopes. c. are the same physically and biologically but differ from other isotopes chemically Od. have an excess number of neutrons e. are produced when substances are exposed to radiation QUESTION 46 Which of the following is most basic? O a. vinegar pH3 O b. milk-pH 6 O c. seawater pH8 O d. oven cleaner- pH12

Explanation / Answer

43- CAM plant

44- Atom is the smallest portion

45- Have excess number of neutrons i.e is option d

46- Oven cleaner has high basic nature

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